bitflipper
You'll probably have to delete the plugin, save the project, and then re-insert it.
Even though two plugins may have exactly the same name and path, they will still be treated as separate entities if their CLSIDs (internal IDs) are different. That is sometimes the case between different versions of the same plugin.
I really believe this could have been better supported by Sonar if the plug-in is missing by not being dependent on just the CLSID alone. If the CLSID doesn't match, since the project still shows the
name of the plug-in in either the FX bin or FX Chain in PC, a quick search through the Plug-In Manager could turn up alternate plug-ins of the same or similar names. If one is found, Sonar would show those and ask if it, either, or any of the alternate(s) would be the same. If the user selects one, Sonar could pull the settings from the missing plug-in and apply them to the new plug-in.
That really can't be so difficult, surely.